This map was created and can be edited at http://simplemaps.com/custom/uk/yWx6qvV4
To remove the "Simplemaps.com Trial" text, purchase a map license. Then, register your license at the link above (Options > Register Purchase). Or, simply replace the ukmap.js file in this folder (trial version) with the ukmap.js file that you are emailed (full version).
To learn how to install this map on your web page, see the Documentation.